A positioning and welding device and a matching and welding method special for the arc-shaped cover of a baler

Abstract

The present application relates to a kind of positioning welding device and group welding method special for bale press arc-shaped row cover, belong to the technical field of welding mould.The positioning assembly and mould body are included, the upper end surface of the mould body is arc surface, its arc is same with the bending arc of the arc-shaped row cover (12) to be welded;The positioning assembly is used for welding positioning to arc-shaped row cover (12), and positioning assembly includes front positioning piece, middle positioning piece and rear positioning assembly.The positive effect of the present application: in the welding process, it can fix arc-shaped row cover, reduce the displacement deformation generated in welding, improve welding precision, ensure that the shape of arc-shaped row cover after welding is standard size consistent.

Description

TECHNICAL FIELD

[0001] The present application relates to a positioning and welding device and a matched welding method for arc-shaped bale ejection covers of a bale press, and belongs to the technical field of welding fixtures. BACKGROUND

[0002] In order to meet the requirements of a round bale compression forming device, a cylindrical compression device is needed. In order to enable materials to fall into the cylindrical compression device, the upper end face of the cylindrical compression device is composed of two symmetrically arranged arc-shaped bale ejection covers. The two arc-shaped bale ejection covers can be opened and closed under the action of a hydraulic cylinder. The adjacent sides of the two arc-shaped bale ejection covers are also provided with cutting knives to cut off materials that have not fallen into the cylindrical compression device. However, during welding, the arc-shaped bottom of the arc-shaped bale ejection cover and the arc of the arc-shaped rib plate may change during welding due to the curved shape of the arc-shaped bale ejection cover, affecting the precision of the device and causing the product to be unable to be used, resulting in increased costs. Therefore, it is necessary to provide a positioning and welding device and a matched welding method for arc-shaped bale ejection covers of a bale press to make arc-shaped bale ejection covers by welding, so as to ensure that the welded arc-shaped bale ejection covers have standard shapes and consistent sizes, and meet the requirements of the bale press. SUMMARY

[0003] The purpose of the present application is to provide a positioning and welding device and a matched welding method for arc-shaped bale ejection covers of a bale press, which can position the arc-shaped bale ejection covers before welding, ensure the arc of arc-shaped components such as the arc-shaped bottom and the arc-shaped rib plate, and at the same time ensure the coaxiality of the shaft sleeve, so as to improve the welding precision of the arc-shaped bale ejection covers of the bale press, ensure the consistency of the shape of the welded bale ejection covers, and solve the above-mentioned problems existing in the background art.

[0004] The technical solution of the present application is:

[0005] The positioning and welding device for the bale press arc-shaped cover is characterized by comprising a positioning assembly and a jig main body, the upper end surface of the jig main body is an arc surface, the curvature of the arc surface is the same as the bending curvature of the arc-shaped cover to be welded, the positioning assembly is used for welding positioning of the arc-shaped cover, the positioning assembly comprises a front positioning member, a middle positioning member and a rear positioning assembly, the front positioning member comprises a cutting knife positioning strip, side plates, a pressing plate support frame one and a positioning plate one, the front side of the jig main body is provided with the cutting knife positioning strip, the left and right sides of the cutting knife positioning strip are provided with the side plates, the front sides of the two side plates are provided with the pressing plate support frame one, and the positioning plate one is detachably arranged on the two pressing plate support frames one, the number of the middle positioning member is at least one set, one set of the middle positioning member comprises two pressing plate support frames two which are arranged in parallel on the left and right sides of the jig main body and a positioning plate two which is detachably arranged on the two pressing plate support frames two, and the rear positioning assembly comprises a shaft sleeve positioning plate and a positioning round steel, the number of the shaft sleeve positioning plate is multiple, the multiple shaft sleeve positioning plates are sequentially arranged on the rear side of the jig main body from left to right, each shaft sleeve positioning plate is provided with a round hole, the positioning round steel penetrates through all the round holes, the center lines of all the round holes coincide with the center line of the positioning round steel, and coaxial positioning is realized.

[0006] Preferably, the jig main body is composed of multiple support plates which are sequentially arranged in parallel from left to right, the number of the multiple support plates and the arrangement distance between the multiple support plates are the same as the number of multiple arc-shaped rib plates of the arc-shaped cover and the arrangement distance between the multiple arc-shaped rib plates, the bottom of each support plate is arranged on the base, the upper end surface of each support plate is an arc, and the curvature of the upper end surface of each support plate is the same as the bending curvature of the arc-shaped cover; the front side of the multiple support plates is provided with the cutting knife positioning strip, the length of the cutting knife positioning strip is consistent with the length of the cutting knife base of the arc-shaped cover, the two side plates are arranged in close contact with the leftmost and rightmost support plates respectively, the two pressing plate support frames one are arranged in close contact with the two side plates respectively, the rear end of each support plate is provided with an arc-shaped groove, one side of the arc-shaped groove is provided with the shaft sleeve positioning plate, and the center of the circle where the arc-shaped groove is located coincides with the center of the round hole of the shaft sleeve positioning plate.

[0007] Preferably, the positioning plate one and the positioning plate two are the same in structure and are composed of a pressing plate and a pressing plate rib plate which are connected through mortise and tenon joint.

[0008] Preferably, the two support plates are a group, and the support plates in the group are connected and fixed through a reinforcing rib plate.

[0009] Preferably, the left and right ends of the cutting knife positioning strip are provided with a stopper between the corresponding side plates.

[0010] Preferably, in the front positioning member, the two pressing plate support frames are each provided with an upwardly open placement slot I, and the left and right ends of the positioning plate I are clamped in the corresponding placement slot I; in the middle positioning member, the two pressing plate support frames II are each provided with an upwardly open placement slot II, and the left and right ends of the positioning plate II are clamped in the corresponding placement slot II.

[0011] Preferably, the center line of the cutting knife positioning strip is parallel to the straight line on which all the center lines of the circular holes are located.

[0012] Preferably, all the shaft sleeves on the welded arc-shaped cover are respectively arranged between the corresponding shaft sleeve positioning plates, and the positioning round steel penetrates through the circular holes and the shaft sleeves on all the shaft sleeve positioning plates, so as to ensure the coaxiality of all the shaft sleeves 122 during welding.

[0013] Preferably, the cutting knife positioning strip is in the shape of a rectangular long strip, and the upper end surface of the cutting knife positioning strip is provided with a plurality of positioning holes arranged from left to right, which are in one-to-one correspondence with a plurality of mounting threaded holes on the cutting knife base of the arc-shaped cover.

[0014] A kind of group welding method specially used for the arc-shaped cover of bale press, arc-shaped cover is welded using the above-mentioned positioning welding jig, the arc-shaped cover includes arc-shaped rib plate, shaft sleeve, connecting rib plate, arc-shaped bottom plate, ear plate, ear plate mounting plate, front sealing plate, cutting knife base and baffle;

[0015] The steps are as follows: first, remove the positioning plate I, the positioning plate II and the positioning round steel, place the pre-bent arc-shaped bottom plate on the jig body, the rear end of the arc-shaped bottom plate is close to the shaft sleeve positioning plate, then adjust the curvature of the arc-shaped bottom plate, so that the arc-shaped bottom plate completely fits on the jig body; then place the shaft sleeve between the corresponding two shaft sleeve positioning plates, and fix the shaft sleeve by reinstalling the positioning round steel; then reinstall the positioning plate I on the pressing plate support frame I, and place the cutting knife base on the cutting knife positioning strip; arrange a plurality of arc-shaped rib plates on the arc-shaped bottom plate in sequence, the rear end of the arc-shaped rib plate is provided with an arc-shaped groove, and the arc-shaped groove completely fits the shaft sleeve; install a plurality of connecting rib plates in the corresponding rectangular grooves of the arc-shaped rib plates in sequence to form a grid structure; install the front sealing plate above the cutting knife base close to the positioning plate I, the positioning plate I positions the cutting knife base and the front sealing plate, the left and right sides of the front sealing plate are respectively provided with rectangular grooves, the baffle is installed in the rectangular grooves, and the baffle is located above the positioning plate I, thus the main frame assembly of the arc-shaped cover is completed; then reinstall the positioning plate II on the pressing plate support frame II to position the main frame; after the main frame positioning is completed, weld the main frame in sequence from top to bottom; finally, symmetrically weld two ear plate mounting plates on the hollow grooves formed by the arc-shaped rib plates and the connecting rib plates, and weld two groups of ear plates on the two ear plate mounting plates respectively, thus the welding of the arc-shaped cover is completed.

[0016] The positive effect of the present application is that the arc-shaped row cover can be fixed during the welding process, the deformation caused by welding is reduced, the welding precision is improved, and the consistency of the shape of the arc-shaped row cover after welding is ensured; the detachable structure simplifies the welding process and improves the production efficiency. BRIEF DESCRIPTION OF DRAWINGS

[0017] Figure 1 It is a structural schematic diagram of an embodiment of the present application;

[0018] Figure 2 It is a schematic diagram of a main body of a mold and a positioning assembly (without installing positioning plate one, positioning plate two and positioning round steel) of an embodiment of the present application;

[0019] Figure 3 It is a rear view of an arc-shaped row cover of an embodiment of the present application;

[0020] Figure 4 It is a front view of an arc-shaped row cover of an embodiment of the present application;

[0021] Figure 5 It is a schematic diagram of a positioning assembly in a disassembled state of an embodiment of the present application;

[0022] Figure 6 It is a completed state diagram of a positioning assembly of an embodiment of the present application;

[0023] In the figure: base 1, support plate 2, arc-shaped groove 21, cutting knife positioning strip 3, positioning hole 31, side plate 4, stop block 5, pressing plate support frame one 6, shaft sleeve positioning plate 7, positioning plate one 8, positioning round steel 9, pressing plate support frame two 10, positioning plate two 11, arc-shaped row cover 12, arc-shaped rib plate 121, arc-shaped rib plate 121, shaft sleeve 122, connecting rib plate 123, arc-shaped bottom plate 124, lug plate 125, lug plate mounting plate 126, front sealing plate 127, cutting knife base 128, baffle 129, cutting knife 130, reinforcing rib plate 13. DETAILED DESCRIPTION

[0024] The present application will be further described below in combination with the drawings and embodiments:

[0025] Referring to Figure 1 and 2 , the present embodiment provides a positioning and welding device special for arc-shaped row covers of a bale press, which comprises a positioning assembly, a main body of a mold and a base 1.

[0026] Referring to Figure 3 and 4 , the arc-shaped row cover 12 to be welded in the present embodiment comprises six arc-shaped rib plates 121, three shaft sleeves 122, four connecting rib plates 123, one arc-shaped bottom plate 124, two sets of lug plates 125, two lug plate mounting plates 126, one front sealing plate 127, one cutting knife base 128, two baffles 129 and one cutting knife 130.

[0027] In order to facilitate workers to carry out welding work, the jig body and the positioning assembly are arranged on the bracketed base 1, and the base 1 is a workbench surface welded by a steel plate and a plurality of rectangular tubes.

[0028] Referring to Figure 2 and 6 , the jig body is a body for assembling and welding each component of the arc-shaped row cover, and in the embodiment, the jig body adopts six support plates 2, the upper end surface of each support plate 2 is arc-shaped, and the radius of the arc-shaped upper end surface is the same as the radius of the arc-shaped row cover 12 to be welded. The six support plates 2 are arranged in parallel from left to right on the base 1, and the arrangement distance between the six support plates 2 is the same as the arrangement distance between the six arc-shaped rib plates 121, so that the welding position of the arc-shaped rib plate 121 on the arc-shaped bottom plate can be accurately found according to the position of the support plate 2 during welding. In order to place the shaft sleeve 122 during welding, the tail end of each support plate 2 is provided with an arc-shaped groove 21. The six support plates 2 are divided into three groups, and each group includes two support plates 2. The two support plates 2 in each group are connected and fixed by a reinforcing rib plate 13 to increase the connection strength.

[0029] In order to position the arc-shaped row cover 12, the positioning assembly is arranged, and the positioning assembly includes a front positioning member, a middle positioning member and a rear positioning assembly.

[0030] The front positioning member includes a cutting knife positioning strip 3, a side plate 4, a stop block 5, a pressing plate support frame 1 6 and a positioning plate 1 8. The cutting knife positioning strip 3 is in a rectangular strip shape and is arranged on the front side of the plurality of support plates 2. A gap is left between the cutting knife positioning strip 3 and the front end of the support plate 2. The cutting knife positioning strip 3 is used for placing a cutting knife base 128. The cutting knife base 128 is provided with a plurality of mounting threaded holes arranged from left to right. A cutting knife 130 is installed on the cutting knife base 128 by matching the mounting threaded holes with bolts. In order to better position the cutting knife base 128, a plurality of positioning holes 31 matched with the mounting threaded holes are arranged on the upper end surface of the cutting knife positioning strip 3. When the cutting knife base 128 is placed, the mounting threaded holes and the positioning holes 31 are matched above and below to be accurately positioned. The left and right sides of the cutting knife positioning strip 3 are respectively provided with the stop block 5. The outer sides of the two stop blocks 5 are respectively provided with the front and rear pressing plate support frames 1 6 and the side plates 4. The left and right ends of the positioning plate 1 8 are arranged in the placing grooves 1 of the two pressing plate support frames 1 6. When the arc-shaped row cover 12 is assembled, the two side plates 4 are tightly attached to the leftmost and rightmost support plates 2. The positioning plate 1 8 positions the front sealing plate 127.

[0031] The number of the middle positioning members is two groups, which are middle positioning member one and middle positioning member two, and the middle positioning member one and the middle positioning member two are arranged in front and back, and the middle positioning member one and the middle positioning member two are the same structure, which are composed of two pressing plate support frames two 10 arranged on the left and right sides of the mold main body and a positioning plate two 11 arranged on the pressing plate support frame two 10 groove.

[0032] The rear positioning assembly includes six shaft sleeve positioning plates 7 and a positioning round steel 9, and the shaft sleeve positioning plate 7 is provided with a round hole. The six shaft sleeve positioning plates 7 are divided into three groups, and each group has two shaft sleeve positioning plates 7. The three groups of shaft sleeve positioning plates 7 are matched with the three groups of support plates 2. The two shaft sleeve positioning plates 7 in each group are symmetrically arranged on the outside of the tail end arc-shaped groove 21 of the support plate 2 in the corresponding group. One shaft sleeve 122 is placed on the tail end arc-shaped groove 21 of each group of two support plates 2. In succession, three shaft sleeves are placed, and the positioning round steel 9 penetrates all the shaft sleeves and the positioning holes to position the shaft sleeves. The center of the circle where the arc-shaped groove 21 is located coincides with the center of the round hole of the shaft sleeve positioning plate 7. The center line of all the round holes coincides with the center line of the positioning round steel 9, which ensures the coaxiality of all the shaft sleeves.

[0033] The positioning plate one 8, the positioning plate two 11 and the positioning round steel 9 are detachable structures, which can simplify the welding process and improve the production efficiency.

[0034] Preferably, the positioning plate one 8 and the positioning plate two 11 are the same structure, which are composed of a pressing plate 101 and a pressing plate rib plate 102 connected by mortise and tenon joint.

[0035] Preferably, the center line of the cutting knife positioning strip 3 is parallel to the straight line where the center lines of all the round holes are located.

[0036] Preferably, the bottom surface of the support plate 2 is a plane, and the side surface and the upper end surface of the support plate 2 form an arc surface as a whole, which is consistent with the outer contour of the arc-shaped bottom plate.

[0037] Preferably, a plurality of positioning holes are arranged on the steel plate, and the bottom mortise of the support plate 2 is welded at the positioning hole.

[0038] Preferably, the round hole on the shaft sleeve positioning plate is the same as the cross-sectional diameter of the positioning round steel, which ensures the positioning accuracy of the positioning round steel.

[0039] A kind of special for bale press arc-shaped row cover's group is welded to a kind of method, using the above-mentioned positioning welding mold to the arc-shaped row cover is welded, the arc-shaped row cover 12 includes arc-shaped rib plate 121, shaft sleeve 122, connecting rib plate 123, arc-shaped bottom plate 124, ear plate 125, ear plate mounting plate 126, front sealing plate 127, cutting knife base 128 and baffle 129;

[0040] The steps are as follows: firstly, the positioning plate one 8, the positioning plate two 11 and the positioning round steel 9 are removed, the pre-bent arc-shaped bottom plate 124 is placed on the jig body, the rear end of the arc-shaped bottom plate 124 is close to the shaft sleeve positioning plate 7, and the arc of the arc-shaped bottom plate 124 is adjusted so that the arc-shaped bottom plate 124 is completely attached to the jig body; then the shaft sleeve 122 is placed between the corresponding two shaft sleeve positioning plates 7, the positioning round steel 9 is fixed to the shaft sleeve 7, the positioning plate one 8 is placed on the pressing plate support frame one 6, the cutting knife base 128 is placed on the cutting knife positioning strip 3, the plurality of arc-shaped rib plates 121 are arranged on the arc-shaped bottom plate 124 in sequence, the rear end of the arc-shaped rib plate 121 is provided with an arc-shaped groove, the arc-shaped groove is completely attached to the shaft sleeve 122, and welding is facilitated; the plurality of connecting rib plates 123 are sequentially installed in the corresponding rectangular grooves of the arc-shaped rib plates 121, and a rectangular grid structure is formed; the front sealing plate 127 is installed above the cutting knife base 128 and close to the positioning plate one 8, the cutting knife base 128 and the front sealing plate 12 are positioned by the positioning plate one 8, the left and right sides of the front sealing plate 127 are respectively provided with rectangular grooves, the baffle 129 is installed in the rectangular groove, the baffle 129 is located above the positioning plate one 8, and thus the main frame assembly of the arc-shaped cover is positioned; then the positioning plate two 11 is installed on the pressing plate support frame two 10 to position the main frame; after the main frame is positioned, the main frame is welded in sequence from top to bottom; finally, two ear plate mounting plates 126 are symmetrically welded on the hollow grooves formed by the arc-shaped rib plates 121 and the connecting rib plates 123, and two groups of ear plates 125 are respectively welded on the two ear plate mounting plates 126, the ear plates 125 are used for connecting the hydraulic oil cylinder, and thus the welding of the arc-shaped cover 12 is completed.

Claims

1. A positioning and welding device for bale press curved bale cover, characterized in that: The utility model relates to a kind of arc-shaped row cover welding fixtures, including positioning component and jig body, the upper end of the jig body is arc surface, its arc is same with the bending arc of the arc-shaped row cover (12) to be welded;The positioning component is used to carry out welding positioning to arc-shaped row cover (12), positioning component includes front positioning piece, middle positioning piece and rear positioning component, the front positioning piece includes cutting knife positioning strip (3), side plate (4), pressing plate support frame one (6) and positioning plate one (8), the front side of jig body is equipped with cutting knife positioning strip (3), the left and right sides of cutting knife positioning strip (3) are equipped with side plate (4), the front side of two side plates (4) is equipped with pressing plate support frame one (6), and positioning plate one (8) is detachably arranged on two pressing plate support frame one (6);The number of the middle positioning piece is at least one group, and one group of middle positioning piece includes two pressing plate support frame two (10) being respectively arranged in the left and right sides of jig body and positioning plate two (11) being detachably arranged on two pressing plate support frame two (10);The rear positioning component includes shaft sleeve positioning plate (7) and positioning round steel (9), the number of shaft sleeve positioning plate (7) is multiple, multiple shaft sleeve positioning plates (7) are sequentially arranged from left to right on the rear side of jig body, each shaft sleeve positioning plate (7) is equipped with round hole, positioning round steel (9) penetrates all round holes, and the center line of all round holes coincides with the center line of positioning round steel, to realize coaxial positioning; The jig body is composed of multiple support plates (2) sequentially arranged from left to right in parallel, the number of multiple support plates (2) and the arrangement distance between multiple support plates (2) are same with the number of multiple arc-shaped rib plates (121) of arc-shaped row cover (12) and the arrangement distance between multiple arc-shaped rib plates (121), the bottom of each support plate (2) is arranged on base (1), the upper end surface of each support plate (2) is arc-shaped, the arc of the upper end surface of each support plate (2) is same with the bending arc of arc-shaped row cover (12), the front side of multiple support plates (2) is provided with cutting knife positioning strip (3), the length of cutting knife positioning strip (3) is consistent with the length of cutting knife base (128) of arc-shaped row cover (12), two side plates (4) are arranged closely with the leftmost and rightmost support plates (2) respectively, two pressing plate support frame one (6) are arranged closely with two side plates (4) respectively, the rear end of each support plate (2) is provided with arc-shaped recess (21), and one side of arc-shaped recess (21) is provided with shaft sleeve positioning plate (7), the center of the circumference where arc-shaped recess (21) is located coincides with the center of round hole of shaft sleeve positioning plate (7), two support plates (2) form a group, and the group of support plates (2) is connected and fixed through reinforcing rib plate (13).

2. A positioning and welding device for bale press arc-shaped bale covering, according to claim 1, characterized in that: The positioning plate one (8) and positioning plate two (11) are same in structure, and are composed of pressing plate (101) and pressing plate rib plate (102) through mortise and tenon joint connection.

3. A positioning and welding device for bale press arc-shaped bale covering, according to claim 1 or 2, characterized in that: The left and right ends of cutting knife positioning strip (3) are provided with stopper (5) between corresponding side plate (4).

4. A positioning and welding device for bale press arc-shaped bale covering, according to claim 1 or 2, characterized in that: The two pressing plate support frames one (6) are each provided with an upwardly open placing groove one, and the left and right ends of the positioning plate one (8) are clamped in the corresponding placing groove one.

5. A positioning and welding device for bale wrap specifically for use in a bale press according to claim 1 or 2, characterized in that: The center line of the cutting knife positioning strip (3) is parallel to the straight line on which the center lines of all the round holes are located.

6. A positioning and welding device for bale wrap specifically for use in a bale press according to claim 1 or 2, characterized in that: All the shaft sleeves (122) on the arc-shaped cover (12) to be welded are respectively arranged between corresponding shaft sleeve positioning plates (7), and the positioning round steel (9) penetrates through the round holes on all the shaft sleeve positioning plates (7) and the shaft sleeves (122), so that the coaxiality of all the shaft sleeves (122) is ensured during welding.

7. A positioning and welding device for bale wrap specifically for use in a bale press according to claim 1 or 2, characterized in that: The cutting knife positioning strip (3) is in a rectangular strip shape, and a plurality of positioning holes (31) are arranged on the upper end surface of the cutting knife positioning strip (3) from left to right, and the plurality of positioning holes (31) correspond one-to-one to a plurality of mounting threaded holes on the cutting knife base (128) of the arc-shaped cover (12).

8. A method of group-welding exclusively for the curved row of bales of a bale press, characterized in that The positioning and welding device is used for welding the arc-shaped cover, and the arc-shaped cover (12) comprises an arc-shaped rib plate (121), a shaft sleeve (122), a connecting rib plate (123), an arc-shaped bottom plate (124), an ear plate (125), an ear plate mounting plate (126), a front sealing plate (127), a cutting knife base (128) and a baffle (129). The steps are as follows: firstly, the positioning plate one (8), the positioning plate two (11) and the positioning round steel (9) are removed, the pre-bent arc-shaped bottom plate (124) is placed on the jig main body, the rear end of the arc-shaped bottom plate (124) is tightly attached to the shaft sleeve positioning plate (7), and the curvature of the arc-shaped bottom plate (12) is adjusted, so that the arc-shaped bottom plate (124) is completely attached to the jig main body; then the shaft sleeve (122) is placed between the corresponding two shaft sleeve positioning plates (7), the positioning round steel (9) is fixed, and the shaft sleeve (7) is installed; then the positioning plate one (8) is installed on the pressing plate support frame one (6), and the cutting knife base (128) is placed on the cutting knife positioning strip (3); a plurality of arc-shaped rib plates (121) are arranged on the arc-shaped bottom plate (124) in sequence, the rear end of the arc-shaped rib plate (121) is provided with an arc-shaped groove, and the arc-shaped groove is completely attached to the shaft sleeve (122); a plurality of connecting rib plates (123) are installed in the corresponding rectangular grooves of the arc-shaped rib plates (121) in sequence, and a grid-shaped structure is formed; the front sealing plate (127) is installed above the cutting knife base (128) and tightly attached to the positioning plate one (8), the positioning plate one (8) positions the cutting knife base (128) and the front sealing plate (12), the left and right sides of the front sealing plate (127) are respectively provided with rectangular grooves, the baffle (129) is installed in the rectangular groove, the baffle (129) is located above the positioning plate one (8), and thus the main frame assembly of the arc-shaped cover is completed; then the positioning plate two (11) is installed on the pressing plate support frame two (10), and the main frame is positioned; after the main frame positioning is completed, the main frame is welded in sequence from top to bottom; finally, two ear plate mounting plates (126) are symmetrically welded on the hollow grooves formed by the arc-shaped rib plates (121) and the connecting rib plates (123), and two groups of ear plates (125) are respectively welded on the two ear plate mounting plates (126), and thus the welding of the arc-shaped cover (12) is completed.

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